Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/30-20 | 245/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.79 (655) | 28.68 (728.5) | 2.89 (73.5) 11.2% |
| Width inches (mm) | 9.65 (245) | 9.65 (245) | 0 (0) 0% |
| Circum. inches (mm) | 81.01 (2057.74) | 90.1 (2288.65) | 9.09 (230.91) 11.2% |
| Sidewall Height inches (mm) | 2.89 (73.5) | 4.34 (110.25) | 1.45 (36.75) 50% |
| Revolutions per mile (km) | 782.09 (485.97) | 703.18 (436.94) | -78.91 (-49.03) -10.1% |
245/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.24 mph (35.8 km/h) |
| 25 mph (40.23 km/h) | 27.81 mph (44.75 km/h) |
| 30 mph (48.28 km/h) | 33.37 mph (53.7 km/h) |
| 35 mph (56.33 km/h) | 38.93 mph (62.65 km/h) |
| 40 mph (64.37 km/h) | 44.49 mph (71.6 km/h) |
| 45 mph (72.42 km/h) | 50.05 mph (80.55 km/h) |
| 50 mph (80.47 km/h) | 55.61 mph (89.5 km/h) |
| 55 mph (88.51 km/h) | 61.17 mph (98.45 km/h) |
| 60 mph (96.56 km/h) | 66.73 mph (107.4 km/h) |
| 65 mph (104.61 km/h) | 72.29 mph (116.35 km/h) |
| 70 mph (112.65 km/h) | 77.85 mph (125.3 km/h) |
| 75 mph (120.7 km/h) | 83.42 mph (134.25 km/h) |
| 80 mph (128.75 km/h) | 88.98 mph (143.2 km/h) |
| 85 mph (136.79 km/h) | 94.54 mph (152.14 km/h) |
| 90 mph (144.84 km/h) | 100.1 mph (161.09 km/h) |
| 95 mph (152.89 km/h) | 105.66 mph (170.04 km/h) |
| 100 mph (160.93 km/h) | 111.22 mph (178.99 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1789 | 2079 | 2239 | 2338 | 2444 | 2520 | 2604 | 2703 | 2840 | 2977 | 3130 | 3252 | 3472 | 3716 | 3906 | 4028 | 4097 | 4348 | 4698 | 5460 |
Better Fuel Economy Factory Ratios Increased Power
